Door-check.



No. 784,093. PATENTED MAB.. 7, 1905. A. S. ADAM.

DOOR. CHECK.

APPLIOATION FILED JUNE 17.1904.

n Stans Patented March 7, 1905..

idrica.

SPECIFCATION forming part of Letters Patent N0. 784,093, dated March fr", 1905.

Application filed June 17, 1904. Serial No. 212,977.

To all w/wm t may concern:

Be it known that l, AeNns S. ADAM, a citizen of the United States, and a resident of the city of idashington, in the District of Columbia, have invented a new and useful Improvement in Door-Checks, of which the following is a specification.

My invention relates to an improvement in door checks, the object being to provide a silnple and inexpensive cheek for doors whose function is to directly sustain the jar "or shock of a door when slammed or closed by a spring whereby to prevent noise and jar; and with the foregoing objects in view my invention consists in a barrel or cylinder adapted to be secured to a door-jamb and having a buffer, one end of which is faced with rubber or other soft material adapted to be struck by the door and the other end with a piston fitted to the wall of the barrel or cylinder and adapted to cooperate with one end of the latter to catch and compress the air between the head and the piston whereby to form an air-cushion which sustains the impact caused by the door closingI against the buffer and gradually exhausts between the piston and bore of the cylinder or in other convenient manner, permitting the door to entirely close, and a light spring' of sullicient resiliency to force the buffer outward upon removingl external inward pressure therefrom.

My invention further consists in certain novel features of construction and combinations of parts which will be hereinafter described, and pointed out in the claims.

In the accompanyingdrawings, Figure Il is a side View of my preferred form. Fig. 2 is a longitudinal section, and Figs. 3 and a are plan views of modifications.

A represents the barrel or cylinder, and B B' are the heads, the heads preferably having annular ianges l l thereon adapted to receive the ends of the barrel or cylinder. ',llhese heads are provided with outwardly-turned flanges 2 2, which have holes 3 3 therein to receive screws or similar means by which the device is secured in position. These :flanges might be turned in the opposite direction, as shown in Fig. 3, or they might be directly on the cylinder, as shown in Fig. 4. Any one of the several forms will answer my purposes, and it is obvious that still other forms might be adopted.

Fitted to the bore of the barrel or cylinder is the cupshaped piston 4f, between which and the rear end or head of the barrel or cylinder the conu)ression-ch'amber 5 is formed, the air suddenly caught therein adapted to form a cushion for the buffer G, held on the outer end of piston-rod 7, in that way sustaining the shock of a door being suddenly slammed or closed, thus el'liectually preventing` noise and jar.

Uonlined within the cupped-out center of the piston and the flanged head of the cylinder at the rear is a slender spiral springl S, the tension of which is just snliicient to restore the piston and buffer to their normal outward position after the door shall have been opened preparatory to sustainingr the impact of the door upon beingI again closed. This spring is of such construction and dimensions that it does not interfere with the piston beingI forced in the full distance. The

spring is not sufl'iciently strongl to allord resistance to the buil'er, as the air-cushion alone does that. The sole object, purpose, and function of the springI is to force the bnller outward in position to perform its bul'lingl function. i

From the foregoing it will be seen that l. have provided a simple device for the accomplishment of the purposes sought, and primarily it is such a device as may be manufactured and marketed ata comparatiwly slight expense.

lt is evident that slight changes might be resorted to in the form and arrangement of the several parts described in addition to those herein mentioned without (fleparting 'from the spirit and scope of my invention, and hence .l do not wish to limit myself to the exact construction herein set forth; but,

Having fully described my invention, what l'claim as new, and desire to secure by Letters Patent, is

l. As an article of manufacture, a pneumatic door-check comprising a barrel or cylinder, heads, a piston, piston-rod and bnli'er, the device constructed and adapted to be sehead of the barrel or cylinder, a piston-rod, at buffer on its outer end, and a spiral spring` confined in the air-cushioning chamber for restoring the buffer to its normal position.

In testimony whereof l have signed this specification in the presence of two subscribing witnesses.

AGNES S. ADAM.

Witnesses:

FRANK E. NEWTON, VERNON E. HODGES. 

